S&S 3-5/8 Big Bore Cylinders Natural Finish Evo Harley 1984-1999 Used

Pair of S&S Cycle 3-5/8-inch big-bore cylinders in natural aluminum finish for Harley-Davidson Evolution Big Twin applications. Overall the cylinders are in very nice used condition with one bent cooling fin as shown in the photos.

Part Number / Markings: S&S 3-5/8-inch bore cylinder family — exact part number not confirmed
Condition: Used – Very Good Overall / One Bent Fin

DETAILS: These are S&S natural-finish aluminum cylinders with a nominal 3-5/8-inch (3.625-inch) bore. The cylinders present very well overall. One cooling fin is bent, as shown in the listing photos. No other major external damage was noted from the supplied description.

S&S offers multiple 3-5/8-inch Evolution Big Twin cylinder configurations, including 5.375-inch-length cylinders for 4-1/4-inch-stroke 88-inch applications and 5.565-inch-length cylinders for 4-5/8-inch-stroke 96-inch applications. Because the exact part number and cylinder length were not supplied, this listing intentionally does not claim one specific 88ci/96ci application.

IMPORTANT: The cylinders are used engine components and should be professionally measured for bore diameter, taper, out-of-round, ring clearance, and piston-to-wall clearance before installation. If these are being reused with existing pistons, verify the pistons and final honing requirements against the S&S specifications for the exact cylinder part number.

USED PARTS DISCLAIMER: This is a used motorcycle engine part and may show normal signs of age, installation, storage, scratches, staining, oxidation, gasket residue, or other cosmetic wear. The bent cooling fin is specifically noted above. The photos show the actual cylinders being sold and are considered part of the description.

FITMENT: S&S 3-5/8-inch cylinders are offered for 1984–1999 Harley-Davidson Big Twin / Evolution applications, but exact fitment depends on cylinder length, stroke, heads, pistons, case machining, and the engine combination. Stock crankcases require machining for the larger 3-5/8-inch cylinder spigot on applicable S&S big-bore configurations. Verify cylinder length, base spigot, head compatibility, piston size, and engine stroke before purchase.

QUESTIONS? Send us a message before purchasing if you need additional measurements, close-up photos, or help identifying the exact S&S configuration.

SHIPPING: Orders are typically processed and shipped within 1–2 business days after payment. These are heavy engine components and will be packed carefully to protect the fins during transit.